The Pangu tool, is totally in Chinese, so for some reason, there is a chance that you have missed a small step of un-ticking the checkbox while installation. You would ask me why this is very important, as the step does nothing bad but only brings in a new app, which comes handy to install paid apps for free! Unfortunately you are wrong. This app is said to programmed with less care and inturn crash many of the stock apps and cause system instability.

How to avoid PPsync installation during jailbreak process

Just disable the checkbox before clicking the Start Jailbreak button.

Disable the checkbox before starting jailbreak. Credits : iPhonehacks

What if you have PPsync already installed? Here is a way to remove it!

For others, who have already installed the package and facing some system crashes.

Add the repo – http://cydia.angelxwind.net/ to cydia

Find net.angelxwind.completeppsyncremover tweak from there and install it.

Additionally, Check Settings > General > Profiles, if you find a 25pp certificate, remove it

Now you have PPsync removed from you phone! Say bye to frequent system crashes and enjoy Cydia!